From Wookiepedia (the free Encyclopedia)
"The hum of the vibroblade gives it away. That's the only reason I still have my face."
―Captain Nym, after a bounty hunter attack on Lok
Vibroblades were a type of bladed melee weapon that used ultrasonic vibrations to increase cutting effectiveness. The weapon's hilt or handle usually contained a compact ultrasonic generator, causing the blade to vibrate at an incredible speed, making even the slightest glancing blow become a gaping wound. Vibroblades were popular among criminals, resulting in them being banned on many worlds. Vibroweapons were common around the Jedi Civil War because as personal energy shields began to become common, blasters were proving ineffective, whereas a vibroweapon could cut through them and the user with ease.

It's light years ahead of its time!
"The hum of the vibroblade gives it away. That's the only reason I still have my face."
―Captain Nym, after a bounty hunter attack on Lok
Vibroblades were a type of bladed melee weapon that used ultrasonic vibrations to increase cutting effectiveness. The weapon's hilt or handle usually contained a compact ultrasonic generator, causing the blade to vibrate at an incredible speed, making even the slightest glancing blow become a gaping wound. Vibroblades were popular among criminals, resulting in them being banned on many worlds. Vibroweapons were common around the Jedi Civil War because as personal energy shields began to become common, blasters were proving ineffective, whereas a vibroweapon could cut through them and the user with ease.

It's light years ahead of its time!